Last visit to my CO2 supplier, I changed my swap out size from a 5lb. tank to a 10lb. tank. The 10lb. tank is a steel tank and it doesn't have a tare weight stamped into it. Can anyone share the tare weight for their 10lb. steel tank? I know there could be variations in weight, but just to get a ballpark estimate. My tank weighs 19lbs. now, so it's definitely getting low. Thanks!